Anytime a creature with a power of four or more enters the battlefield, you get to draw a card, which is great since most creatures in your deck are pretty beefy
Add an untapper like Thousand-Year Elixir to the mix and youll find yourself with tons of mana
These spells harkened back to incredibly powerful spells from Magic 's past
As a brief mathematical aside (feel free to check my work, Quandrix nerds), here is a short comparison of non-generic/staple overlaps with the appropriate predecessor across each Secrets of Strixhaven Commander deck, not counting Sol Ring or Arcane Signet nor generic/staple lands: 7 cards from Silverquill Influence overlap with Silverquill Statement 10 cards in Witherbloom Pestilence to Witherbloom Witchcraft 10 cards in Prismari Artistry to Prismari Performance 5 cards in Lorehold Spirit to Lorehold Legacies 9 cards in Quandrix Unlimited to Quantum Quandrix Seeing the data laid out as such, it's hard to justify my vibes-based analysis as anything more than a poorly calibrated vibes antenna
Boromir, Warden of the Tower You need to play Boromir, Warden of the Tower at sorcery speed, but you get some value, namely with that second ability